@sdev Quick question on this issue.

I've traced the issue back to a USB device that creates an Ethernet interface on the OS. I suspect that the issue was caused by the USB device not being ready by the time ddclient tried to start and bind to configured interfaces, causing the boot time configuration to fail. Given that this is an edge case that would rarely occur, and now that I have replaced the USB device with an actual Ethernet device, I'm happy to close this bug report.

Deprecated commands are deleted.
It should be reimplemented if it is needed in a separate feature request/task

PR https://github.com/vyos/vyos-1x/pull/2852 basic implementation

https://github.com/vyos/vyos-1x/pull/2850

Will be fixed in 1.4.0-rc3

After some research, I have concluded that the error was caused by the string's violation of RFC 3986, which recommends using percent encoding instead. I'll look into the feasibility of implementing percent encoding/decoding (which urllib natively supports) for spicy characters if there's demand, but the recommended method in VyOS right now is using the protocol-agnostic REMOTE_USERNAME and REMOTE_PASSWORD environment variables, which bypass the URL decoding step. The alternative would involve messing with urllib.parse's internal parser to implement a laxer and less greedy regexp to accept passwords like this, which is probably a bad idea.

What are you expecting

This should pretty much explain it

Let's not close it now, as we do not fully understand the cause

https://github.com/vyos/vyos-1x/pull/2846

That doesn't seem to insert missing leaf nodes, so I rebuilt the installation by copy/paste of commands from existing VM, and it migrated the routes as expected upon upgrade to 1.4-rc2.

Expecting minimal working config:

set qos policy shaper-hfsc SHAPE bandwidth '400mbit'
set qos policy shaper-hfsc SHAPE class 10 linkshare m2 '200mbit'
set qos policy shaper-hfsc SHAPE class 10 match DST ip destination address '192.0.2.1/32'
set qos policy shaper-hfsc SHAPE default linkshare m2 '111mbit'

See https://vyos.dev/T5958

It causes the issue with no qos config after update (from 1.3.5)
Before migration

set traffic-policy shaper-hfsc SHAPE-10mbit bandwidth '400mbit'
set traffic-policy shaper-hfsc SHAPE-10mbit class 10 linkshare m2 '200mbit'
set traffic-policy shaper-hfsc SHAPE-10mbit class 10 match MARK mark '10'
set traffic-policy shaper-hfsc SHAPE-10mbit default linkshare m2 '200mbit'

Incorrect firewall setting block the communication

We agree not to implement this, at least in the proposed format.
Close it as wontfix.

Waiting for the stable release Release v2.20

In T5947#172846, @kevinrausch wrote:

Well, it didn't start on 1.3.2, so I don't know how the empty leaf nodes could have disappeared over time.

Is there a way to force a full rewrite of the config.boot before attempting upgrades?

I can not reproduce it with the above commands. Even not getting any IP address on the DHCP interface lets ddclient start

Well, it didn't start on 1.3.2, so I don't know how the empty leaf nodes could have disappeared over time.

Your original config looks corrupted.
For example
Loopback entry:

loopback lo

Expected entry:

loopback lo {
}

Sounds good. I'll do some updates and testing to see if I can move the chains to a dedicated inet table for upnp. The IPv6 use case is probably just to use UPnP/NAT-PMP/PCP to open firewall ports but for completion reasons I'll implement it.

So, the problem seems to be with empty leaf nodes missing from my baseline config.